Creating your Brownie Cheesecake is simple if you follow these steps:

1. Preheat Oven: Begin by preheating your oven to 325°F (165°C). Grease a 9-inch springform pan.
2. Make Brownie Batter: In a large saucepan, melt the butter over low heat. Remove from heat and stir in sugar, eggs, and vanilla until smooth.
3. Add Dry Ingredients: Sift in flour, cocoa powder, salt, and baking powder. Mix until just combined.
4. Spread Batter: Pour the brownie batter into the prepared springform pan. Spread evenly and set aside.
5. Prepare Cheesecake Mixture: In a mixing bowl, beat the softened cream cheese until creamy. Gradually add sugar and vanilla, mixing until smooth.
6. Combine Eggs and Sour Cream: Add in eggs, one at a time, mixing well after each addition. Then fold in sour cream and flour until incorporated.
7. Layer Cheesecake Mixture: Pour the cheesecake batter over the brownie layer in the springform pan. Spread evenly with a spatula.
8. Bake: Place the pan in the preheated oven. Bake for 50-60 minutes or until the edges are set but the center still has a slight jiggle.
9. Cool: Remove from the oven and allow to cool at room temperature for 1 hour. Then, refrigerate for at least 4 hours, preferably overnight.
10. Serve: Run a knife around the edges before removing from the springform pan. Slice and serve chilled.

By following these straightforward steps, you’ll create a spectacular Brownie Cheesecake that’s sure to impress.